Telephone receiver



April 20,1926. v 1,581,237

. -M. H. SPIELMAN TELEPHONE RECEIVER vFiled Dec. 4. 1922 2- Sheets-Sheet1 5 l\ 26 U I y 1h; \\l"""' JZIYEHTOR April 20-, 1926. 1581237 M. H.SPIELMAN TELEPHONE RECEIVER a Filed Dec. 4', 1922 2 Sheets-Sheet 2 all Afvymgtz'oji Q .WJQRW .ATTYS.

Patented Apr.. 20, 1926.

4 UNITEDSTAITES,

MILTON H. SPIELMAN, or CLEVELAND, on r hsslenon TO THE noMEs'rIoELECTRIC PATENTAOFFICE.

COMPANY, OF CLEVELAND, OHIO A CORPORATION OF OHIO.

TEL PHonE RECEIVER,

App licationfiled December 4, 1922. Serial No. 4,703; i

To all whom it may concern.

Be it knownthat I, MILTON H. SPIELMAN, a citizen of the United Statesresiding at Cleveland, in the county'of Guyahoga and State of Ohio, haveinvented a certain new and useful Improvement in Telephone R eceivers,of which the following'is a full,

clear, and exact description,referencebeing had t9 the accompanyingdrawings.

.TlllS invention relates to telephone. re ceivers, particularly to the'watch case type such as are most frequently used in radio telephony. p

In the manufacture of watch case receivers, considerable difficulty hasheretofore been experienced in assembling the permanent magnet memberand associated coils. One of the causes of these difliculties is thesmall space within which the parts must be assembled, and the degree ofaccuracy which must be used to provide and maintain an electricalcircuit through the resistance coils.

I have found that soldering leads from the coils to electricalconnections extending through the casing, necessitates considerabletime.

Accordingly one of the objects of my 111.- vention is to so constructthe permanent magnet that it comprises a single easily positioned pieceand likewise the electro-mag netic coils and cores comprise an assembledunit completed outside the casing adapted to complete its rmagnetlc andcircuit connections by simply' placing itin position, thus avoiding anation within the'caSing...

Other objects include thearrangenient of a unitary coil structurewhereby replacement thereof may be readily accomplished withy solderingoper out necessitating replacement of a complete In addition, myinvention provides for a permanent magnet construction which occupies aminimum space. The magnet construction contemplated, permits thereceiver to be readily dismantled'and the magnet to be replaced withoutaffecting the electrical connections between the coils and the leadsextendingtherefrom. a

In carrying out my invention, I employ the usual casing, a diaphragm andear piece with electrical connections leading from the exterior of thecasing to the interior thereof. Within the casing, I provide an endlesspermanent magnet having opposed pole pieces and I provide coils havingthe cores -marized inthe claims; r In the draw1ngs,'F1g. l-is an endview of ings, and the essential features will be"sum-- a receiverembodying my invention and showing the provision for attachment of ahead strap; Fig. 2 is a rear view of the re 7 ceiver shown in Fig.vlyhig. 3 is a plan Viewof the receiver having the ear piece anddiaphragm removed; Figs. 4 and 5 are sec- [310113011 the llnes H and 55respectively,

in Fig. '3 and Fig. 6 is a perspective View showing the relative"position for assembling of the various vention.

Designating the parts shown in the drawings by the use of referencecharacters, 10' indicates a casing having a diaphragm 11,,

and an ear piece 12 associated therewith.

Within the casing, I provide anendless pere manent magnet, indicated at13,-and a coil 14 positioned thereabove. The particular con-- structionof the magnet and coil, together with the'manner of connection to thecasing,

embody particular features of my invention as will now be described.

.The permanent magnet is shown as comprising. anannular member havingopposed pole pieces 15 and 16 extending lnwardly' and formed integralwith the ring-like body of the magnet. -This magnet'may be a metallicstamping, which is hardened in the usual manner and fitting closely inthe side wall of the casing,flyingflat against the bottom or rearwallthereof. Suitable openings 17 and 18 extend through the magnet forreceiving clamping screws 19 and 20.

Thecoil and pole piece extensions comprise a single unitary structurewhich is readily adapted for attachment 1 mechanically and electricallywithin the casing. Each extension member constitutesthe core of a coil,and is adapted to be attached to the magnet by the same securing membersemployed for retaining the magnet within parts, as set forth in myinthecasing. To this end, I have shown each core as comprising an L-shapedmember, one arm of which, as at 25 and 26, extends through the coils andother arms, as at 27 and 28, engage the magnet, as illustrated in Fig.4.

The terminals from the coil lead outwardly and are electricallyconnected to contact members in the nature of eyelets 29 and 30 whichare shown as flanged to embrace a flexible base extending transverselyof the pieces 27 and 28. This base is formed of insulating material,such as fibre, and is adapted to fit over the upwardly extending arms otthe pole extensions. A suit able non-magnetic spacing member 36 extendsover the ends of the arms 25 and 26 closely embracing the same andmaintains the coils permanently in position.

The magnetic core and arms are each preterably made of soft magnet coreiron andas the flat portions 27 and 28 may fit closely upon the polepieces ot the permanent magnet, magnetic flux is established throughthese elements, which rluX may be varied in the usual way by the actionof the electromagnetic coils to vibrate the diaphragm 11. The small wireterminals ot the coils may be conveniently electrically connected to theeyelets 29 and 30 by simply soldering them or clamping the wire beneaththe edge thereof, forming a permanent electrical connection which neednot thereafter be disturbed; these eyelets later forming connection bysimply pressing against binding posts which will be described.

hen the coil and extension pieces are assembled, as shown in Eig. (3,openings 21 and 22 in the core arms are in registration with theopenings 17 and 18 in the permanent magnet. Accordingly, the eyelets 29and 30 are in position to engage contact members 37 and 38 which areshown as bindscrews eitending through the casing on a line transverselyof the attaching screws 19 and 20. Suitable washers 40 may be placedbeneath the heads of the contact members 37 and 38 to cause an upwardpressure to be exerted against the under surface of the eyelets, wherebythe inherent resiliency in the base maintains an electrical circutthrough the coil. In this way, the coil may be readily assembled outsidethe casing and then connected electrically with the connections leadinginto the casing, when the extension pieces are attached to the "fasteninmembers 19 and 20.

i have shown my invention as adapted for use in radio telephony whereintwo receivers n'iay be mounted on a head strap 50. The nanner ofmounting embodied in a bracket 51 which straddles the casing and ispivoted on suitable trunnions 52 associated with the exterior or thecasing. A spindle 53 may be rigidly secured to the intermediate portionof the bracket and is adapted to carry the ends of the head strap. Tosecure adjustment, I have shown the end of the strap as having anapertured member 54 which engages the spindle and is loosely mountedthereon. A spring 55 also having an opening therein which fits over thespindle, is rigidly attached to the strap in such manner as to extend atan angle therefrom, as indicated in Fig. 1. The inherent resiliency otthe spring, and the inclination from the strap is such that the spindleis gripped with sullicient force to retain the strap in any desiredposition. To adjust the receiver, the spring and member 54; are pressedtogether, whereupon the spindle may be moved in either directionrelatively to the strap. when the desired adjustment is obtained, thespring is released, whereupon the spindle is gripped in a new position.

To assemble the receiver in accordance with my invention, the magnet isplaced within the casing with the openings 17 and 18 extending over theattaching screws 19 and 20, and then the coil is positioned within thecasing with the openings 21 and 22 in the extensions in registrationwith the openings in the magnet. This brings the extension pieces intoengagement with the pole pieces. When the attaching men'ibers 19 and 20are tightened, the eyelets 29 and 30 with which the leads from the coilsare elcc trically connected, are brought into engagement with thecontact members 37 and 38, which extend through the casing at pointsequidistant from the screws 19 and 20. Then the electrical connection iscompleted by attaching wires and 61 outside the casing. A knob 62extending through the center ot' the casing, serves as a post forattaching a tape to relieve the tension between the wires and theconnections therefor on the e terior ot the casing. 111 the event thereceiver is used as a head phone, then the brackets 51 carrying thetrunnions may be snapped into position upon the casing. The receiversare then adjusted as heretofore described.

By constructing a receiver in accordance with my invention, a greaternumber of ampere turns is obtainable, by reason oi the fact that theone-piece magnet lies flat within the casing and therefore requirescomparatively little space. The construction of the magnet and theassociated coils, permits these parts to be readily assembled andreplaced without necessitating the making of electrical connectionswithin the casingf I claim:

1. In a device of the class described, the

combination with a casing, of a onepi.ece

magnet positioned within the casing, said magnet having opposed polepromotions,

coils having the cores thereot shaped to rest I on the sole 31GCQS andto rovide extensions net, means for removably securing the coils withinthe casing, electrical conductors extending through the casing, remotefrom the magnet connections to the'casing'and means for automaticallveit'ectin electrical contact u h between the leads from the coil andsaid con ductors when the coils are positioned within.

said casing, and the cores thereof are brought into engagement with saidmagnet.

3. In a device of the class describechthe combination with a casing,ot'a magnet carried thereby, a coil having the cores thereof extendingalong and; resting on said magnet, electrical connections extendingthrough the casing, and flexible means carried by the coil andsupporting coil terminal contacts for eliiecting electricaleontactbetween the coils and connections.

- 4. In a device of the class described, the

combination with a casing having a permanent magnet therein, of coilshaving cores which extend in opposite directions to rest on said magnet,means extending transversely of the core extensions and carrying theleads from the coils, and electrical connections extending through thecasing remote from the magnet and adapted to engage said means forcompleting an electrical circuit through the coil, said engagement beingeffected upon contact of the core'extensions withsaid magnet. I

5. In a device of the classdescrib'ed, the

combination with'a casingliaving a perma- I nent magnet therein, of acoil carried thereby, a flexible member supported by the COll andcarrying the leads therefrom, electrical connections extending throughthe casing remote from the magnet and adapted to.

engage said leads for completing an electrical circuit through the coil,said engagement being eflected upon contact of the coil with saidmagnet;

6.111 a device of the class described, the I combination with a casing,of a one-piece magnet carried thereby, said magnet having inwardlyextending pole pieces thereon, coils associated therewith, the cores ofsaid coils extending laterally in opposite directions, and are adaptedto rest upon said pole pieces, a flexible base of insulating materialprojecting laterally from the coil and transversely of said coreextensions, said base carrying the leads from said coils, electricalcontact pieces associated with the casing, and means whereby contact ofthe core'extensions and magnet effects an interengagement of the leadsfrom the coil with said contact pieces. 1

' 7. In a device of the class described, the combination with a casing,of anannular magnet having inwardly extending pole promot ons lntegraltherewith, electrical conductors extending through the casing,

and remote from the magnet connections, a

coil, the cores of which comprise feet resting on the pole pieces, and abase for the coil,-'said base carrying contact members which are adaptedto engage the conductors for completing an electrical circuit throughthe conductors and coil when the coresof the coil are attachedto themagnet.

8.111 a deviceof the class described, the

combination with a casing, of an annular magnet having inwardlyextending pole pieces positioned diametrically opposite each other,L-shaped members, each having one arm thereof resting on a 13016131808,coils associated with the other arm of each mem 7 her, electricalconductors passing through the bottom of the casing, means for attachingthe members to the magnets, and means whereby such attachment effectselectrical contact between said conductors and the leads from saidcoils. p

In testimony whereof, I hereunto affix my signature.

' MILTON H. SPIELMAN.

